计及临界稳定特性的感应电动机群等值方法

Group Equivalent Method of Induction Motors Considering Critical Stability Characteristics

为降低感应电动机临界稳定特性对感应电动机群等值的影响,提高感应电动机群等值模型的准确性和适用性,本文提出一种计及安全临界电压和临界切除时间的感应电动机群等值方法。首先,分析表征感应电动机临界稳定特性强弱的指标,结合聚类分析算法,将感应电动机群分为稳定性不同的3组。其次,依据感应电动机群等值的基本原则,求解等值感应电动机电气参数。最后,以IEEE-9节点系统为算例,比较通过本文方法和现有方法得到的等值模型在不同故障下的系统响应。仿真结果表明,本文方法得到的等值模型能更好地还原原感应电动机群的工作特征。

In order to reduce the influence of the critical stability characteristics of induction motors on the induction motor group equivalence and improve the accuracy and applicability of the induction motor group equivalence model,an induction motor group equivalence method considering the safe critical voltage and critical clearing time is proposed.Firstly,the indicators that characterize the strength of the critical stability characteristics of the induction motor are analyzed and combined with a cluster analysis algorithm to classify the induction motor group into three groups with different stability.Secondly,based on the basic principle of induction motor group equivalence,the electrical parameters of the equivalent induction motor are solved.Finally,the IEEE-9 node system is used as an arithmetic example to compare the system response under different faults for the equivalent model obtained by the method in this paper and existing methods.The simulation results show that the equivalent model obtained by the method in this paper can better reproduce the operating characteristics of the original induction motor group.